In Greco-Roman mythology, Juno was Jupiter's wife (and sister... hmm). Jupiter would shroud his behaviors in clouds, but Juno could part them and see what Jupiter was up to. Launched five years ago, NASA's Juno spacecraft will be lifting the veil on Jupiter when it enters Jovian orbit on the Fourth of July.
The craft, the fastest thing ever built by humans, will gather data on the gas giant's magnetosphere, its gravity and its very composition. This data could help provide insight on many of the exoplanets we've so far discovered, as a great number of them appear compositionally similar to Jupiter.